JP2784986B2 - Soundproof engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof type engine and, more particularly, to a soundproof engine capable of reducing the expansion noise of exhaust gas.

[0002]

2. Description of the Related Art As a conventional technology of a soundproof type engine, as in the present invention, a vertical engine body is housed in a soundproof case.
Some have a basic structure in which a cooling fan is mounted on the front side of the engine body and an exhaust muffler is arranged on the side of the engine body.

In this type, noise such as an explosive sound generated in a combustion chamber of an engine body, a vibration sound generated from an operating portion of the engine body, and a wind noise of a cooling fan is blocked by a soundproof case. In addition, the cooling air sucked from the air inlet by the airflow of the cooling fan flows along the left and right sides of the engine body by the airflow of the cooling fan, and the engine body is air-cooled from both sides and exhausted. The muffler is also cooled at the same time.

[0004] By the way, in this type, conventionally, cooling air is configured to flow almost equally to both left and right sides of the engine body.

[0005]

In the above-mentioned prior art, a substantially equal amount of cooling air flows between the exhaust muffler side where exhaust heat is concentrated and the intake side where heat is not concentrated among the left and right lateral sides of the engine body. In addition, the supply amount of the cooling air to the exhaust muffler is insufficient, and the exhaust gas in the exhaust muffler is discharged into the atmosphere at high temperature and high pressure, and the expansion noise is large.

An object of the present invention is to provide a soundproof type engine capable of reducing the expansion noise of exhaust gas.

[0007]

(First Invention) As shown in FIG. 1, a first invention accommodates a vertical engine body 2 in a soundproof case 1 and a cooling fan in front of the engine body 2. 3, and an exhaust muffler 29 is arranged on the side of the engine body 2. In the soundproof type engine, the air inlet 5 is opened in the front wall 4 of the soundproof case 1 at a position facing the cooling fan 3. Predetermined case wall 1
The exhaust port 13 is opened in the exhaust muffler 29 or the exhaust muffler 29 side of the left and right sides of the engine body 2, and the exhaust introduction port to the exhaust port 13 behind the exhaust muffler 29. 38 open, exhaust air from the exhaust inlet port 38
An exhaust fan 37 is provided in the exhaust space 15 extending to the opening 13.
And, characterized in that.

(Second Invention) According to a second invention, in the soundproof type engine illustrated in FIG. 1, an exhaust muffler 29 is provided at a position lower than the cylinder head 23 as illustrated in FIG. It is characterized in that the exhaust outlet pipe 40 led out to the rear is raised toward the case upper wall 12 of the soundproof case 1.

(Third invention) In a third invention, in the soundproof engine of the second invention illustrated in FIG. 1, an exhaust discharge pipe 42 is provided on the case upper wall 12 of the soundproof case 1, and the venturi is attached to the exhaust discharge pipe 42. The Venturi section 4
3 is characterized in that the end opening 44 of the exhaust outlet pipe 42 is exposed.

[0010]

Operation and Effect of the Invention (First Invention) The first invention has the following operation and effect. As illustrated in FIG. 1, the cooling air that has passed backward through the exhaust muffler 29 due to the blowing air from the cooling fan 3 is quickly exhausted from the exhaust port 13 through the exhaust air introduction port 38 located on the rear side of the exhaust muffler 29. Since the air is blown, the flow of the cooling air on the exhaust muffler 29 side becomes smooth, and the flow rate of the cooling air passing through the exhaust muffler 29 side increases . Moreover, this exhaust muffler 29
The flow rate of the cooling air on the side is
Since the exhaust muffler 29 is further strengthened, the exhaust muffler 29 is strongly cooled by the enhanced cooling air, the temperature of the exhaust gas in the exhaust muffler 29 is reduced, the pressure of the exhaust muffler 29 is reduced, and the expansion noise upon release to the atmosphere is reduced.

(Second Invention) The second invention has the following functions and effects in addition to the functions and effects of the first invention. As illustrated in FIG. 1, the rising dimension of the exhaust outlet pipe 40 becomes longer, and a large cooling air blows from the exhaust outlet pipe 40. For this reason, the exhaust gas in the exhaust outlet pipe 40 is strongly cooled, the temperature of the exhaust gas is reduced, and the pressure is reduced.
Expansion noise upon release to the atmosphere is further reduced.

(Third invention) The third invention has the following functions and effects in addition to the functions and effects of the first invention or the second invention. As illustrated in FIG. 1, a negative pressure is generated in the venturi portion 43 by the exhaust gas discharged from the terminal opening portion 44 of the exhaust gas discharge tube 42, and the air in the soundproof case 1 is supplied to the exhaust gas discharge tube 42 from below. The air is sucked and mixed with the exhaust gas in the exhaust pipe 42. For this reason, the temperature of the exhaust gas in the exhaust pipe 42 decreases, the pressure thereof decreases, and the expansion noise at the time of release to the atmosphere decreases.

[0013]

An embodiment of the present invention will be described with reference to the drawings.
1 to 3 are diagrams for explaining an embodiment of the present invention. This embodiment is a soundproof type engine unit, and its configuration is as follows. That is, as shown in FIG. 1, the engine body 2 is housed in the soundproof case 1. The soundproof case 1 is configured such that a pair of front and rear portal frames 19 are erected on a base frame 18 constituting a bottom portion, and a metal plate is formed into a rectangular box shape using the frame as a framework. A hook locking ring 21 for lifting is attached to the upper side of each portal frame 19. A sound absorbing material 20 made of urethane is lined on almost the entire inner surface of the soundproof case 1.

The engine body 2 housed in the soundproof case 1 is a vertical water-cooled, multi-cylinder diesel engine, in which a cylinder head 23 and a head cover 24 are sequentially assembled above a cylinder block 22.
The oil pan 25 is attached to the lower side. FIG.
As shown in (A), when viewed from the front side of the engine body 2,
A cooling fan 3 is attached to the front center of the engine body 2, an alternator 26 and an exhaust manifold 28 are arranged on the right side of the cylinder head 23, and an intake manifold 27 is arranged on the left side of the cylinder head 23. Is provided with an exhaust muffler 29.

As shown in FIG. 1, a starter motor 30 is disposed on the right side of the cylinder block 22, and a flywheel 31 is provided on the rear side of the engine body 2, and a ring gear 32 externally fitted to the flywheel 31 is provided. And the pinion gear 33 of the starter motor 30 is meshed. As shown in FIG. 2A, the engine main body 2 is supported on the base frame 18 via vibration-proof rubber 34. In the soundproof case 1, stays 52 project inward from both left and right sides,
A rubber receiving rubber 51 is attached to the end thereof, and the intake manifold 27 and the frame member 53 provided on the head cover 24 are brought into contact with the rubber receiving rubber 51, thereby suppressing the engine body 2 from swaying. A radiator 35 is disposed in front of the cooling fan 3 of the engine body 2 shown in FIG. 1, and an air intake port 5 is opened in the case front wall 4 of the soundproof case 1 at a position facing the cooling fan 3 with the radiator 35 interposed therebetween. An exhaust port 13 is formed in the case upper wall 12.

In this soundproof engine unit, noise such as an explosion sound generated in a combustion chamber of the engine body 2, a vibration sound generated from an operating portion of the engine body 2, and a wind noise of the cooling fan 3 are absorbed in the soundproof case 1. It is absorbed by the material 20 and is sound-insulated by the soundproof case 1 to some extent. The cooling air sucked from the air inlet 5 by the wind of the cooling fan 3 passes through the radiator 35 to radiate the heat. The cooling air that has passed through the radiator 35 flows along the left and right sides of the engine body 2 by the blowing air of the cooling fan 3, and cools the engine body 2 from both the left and right sides, and simultaneously cools the exhaust muffler 29 and the like. I do. The cooling air after the air cooling of the engine body 2 and the like becomes the exhaust heat air, and the exhaust port 1
3 is exhausted.

In this embodiment, in order to promote cooling of the exhaust muffler 29 and the like disposed on the right side of the engine body 2,
The following configuration is employed. That is, FIG.
As shown in (A), an inclined portion 36 inclined downward to the right on the case upper wall 12 of the soundproof case 1 above the exhaust muffler 29.
Is provided here, and the exhaust port 13 provided with the exhaust fan 37 is provided here.
Has been opened. A wind shield plate 14 parallel to the inclined portion 36 faces the air outlet 13 from below, and both left and right sides of an air exhaust space 15 formed between the wind shield plate 14 and the air outlet 13 are closed. I have. As shown in FIG. 1, an exhaust introduction port 38 is opened on the rear side of the exhaust space 15, and
It is located behind 9. A protective cover 39 (see FIG. 3) provided with a net material is mounted above the inclined portion 36 of the case upper wall 12.

According to such a configuration, as shown in FIG. 1, the cooling air that has passed rearward through the exhaust muffler 29 due to the blowing air of the cooling fan 3 absorbs the exhaust air from the exhaust fan 37 and the exhaust inlet 38. From the exhaust muffler 29
The cooling air flow on the side becomes smooth, and the exhaust muffler 29
The flow rate of the cooling air passing through the side increases, and the exhaust muffler 29,
Exhaust manifold 28, alternator 26, starter motor 3
0 is strongly cooled, and these overheatings are suppressed. Among them, the cooling of the exhaust muffler 29 not only suppresses its overheating, but also has the advantage of lowering the temperature of the exhaust passing therethrough, lowering its pressure, and reducing the expansion noise upon release to the atmosphere. .

In this embodiment, the following configuration is employed in order to further reduce the expansion noise of the exhaust gas. That is, as shown in FIG. 1, the exhaust muffler 29 is provided at a position lower than the cylinder head 23, and the exhaust outlet pipe 40 led out rearward from the exhaust muffler 29 is provided on the case along the case rear wall 41 of the soundproof case 1. It is standing up to the wall 12. According to such a configuration, the rising dimension of the exhaust outlet pipe 40 becomes longer, and this exhaust outlet pipe 4
A lot of cooling air blows to zero. Therefore, the exhaust gas in the exhaust pipe 40 is cooled, the temperature of the exhaust gas is reduced, the pressure is reduced, and the expansion noise when the exhaust gas is discharged to the atmosphere is further reduced.

Further, as shown in FIG. 1, an exhaust discharge pipe 42 is provided on the case upper wall 12 of the soundproof case 1 behind the air outlet 13.
A venturi portion 43 is provided inside the exhaust discharge pipe 42, and the terminal opening 44 of the exhaust outlet pipe 42 faces the venturi section 43. A negative pressure is generated in the venturi section 43 by the discharged exhaust gas, the air in the soundproof case 1 is sucked into the exhaust discharge pipe 42 from below, and the air is mixed with the exhaust gas in the exhaust discharge pipe 42. Therefore, the exhaust discharge pipe 42
The temperature of the exhaust gas in the chamber is reduced, the pressure thereof is reduced, and the expansion noise at the time of release to the atmosphere is reduced.

In this embodiment, the following configuration is employed to suppress the leakage of the wind noise of the cooling fan 3. That is, as shown in FIG. 1, as described above, the air inlet 5 is opened in the case front wall 4 of the soundproof case 1 at a position facing the cooling fan 3 of the engine body 2. A silence box 6 is attached to the outside of the case front wall 4. As shown in FIG. 2B, the sound deadening box 6 is formed in a U-shape in plan view from the case front wall 4 of the soundproof case 1 along the case left and right lateral walls 45, and a sound absorbing material 46 is lined on its inner surface. ing. A communication port 47 is opened in the sound deadening box 6 at a position facing the air suction port 5, and the inside of the sound deadening box 6 communicates with the air suction port 5. Outside air inlets 7 are opened on both left and right sides of the sound deadening box 6.

According to such a configuration, as shown in FIG. 1, the leakage of the wind noise of the cooling fan 3 from the air intake port 5 is suppressed by the air intake, and the wind noise that leaks from the wind fan 6 is suppressed by the sound deadening box 6. Is reduced within. For this reason, the volume of the wind noise emitted from the outside air inlet 7 into the atmosphere is reduced, and it is possible to promote quietness of the environment around the soundproof case.

In this embodiment, as shown in FIG. 1, an air outlet 1 is provided to further quiet the environment around the soundproof case.
Sound absorbing members 16 are provided on both surfaces of a wind shield plate 14 facing the engine body 3 and the engine body 2, respectively. Thereby, the explosion sound generated in the combustion chamber of the engine body 2
Various noises such as vibration noises generated from the operating part of the above are absorbed by one sound absorbing material 16 facing the engine body 2, and when passing through the exhaust space 15, the other sound absorbing material 16 facing the exhaust port 13 Absorbed. For this reason, the volume of the noise emitted to the atmosphere from the air outlet 13 is also reduced, and silence around the soundproof case can be further promoted.

In this embodiment, the noise reduction box 6 is made detachable from the case front wall 4 of the soundproof case 1 in consideration of the case where compactness is more strongly required than the quietness of the surrounding environment. A dustproof net 8 is provided. Thereby, the sound deadening box 6
Can be removed to reduce the size. still,
In this case, the dust net 8 suppresses dust from entering the soundproof case 1 from the air inlet 5.

In this embodiment, the use of the intake duct 17 is taken into consideration, and the intake duct connection box 9 is provided. The sound deadening box 6 and the intake duct connection box 9 are exchanged with each other outside the case front wall 4 of the soundproof case 1. It can be attached and detached. This allows
When the silencing box 6 is replaced with the intake duct connection box 9, the intake air can be introduced from a remote location of the soundproof case 1 via the intake duct 17. For this reason, for example, when the soundproof case 1 is installed in a dusty atmosphere, clean air can be introduced into the intake port 5 from the remote place with little dust via the intake duct 17, and the dustproof net 8 Clogging can be suppressed.

In the above embodiment, the muffling box 6, the intake duct connection box 9, the protective cover 39, the intake case 49 and the flywheel cover 50 shown in FIG. 1 are all detachable. A plurality of types having different shapes and colors are prepared for each of these components. For this reason,
Parts can be selected and the appearance can be adjusted according to the user's request.

Although the contents of the embodiments of the present invention are as described above, the present invention is not limited to the contents of the above embodiments. For example, in the above embodiment, a soundproof engine unit in which only the engine body and its attached parts are accommodated in the soundproof cover is used. However, the present invention can be applied to any soundproof engine, and the generator is installed in the soundproof cover. The present invention can also be applied to a soundproof engine working machine containing a working machine such as a pump or a pump.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a soundproof engine unit according to an embodiment of the present invention.

FIG. 2A is a sectional view taken along line II-II of FIG. 1, FIG.
FIG. 2B is a sectional view taken along line BB of FIG.

FIG. 3 is a perspective view of the soundproof engine unit of FIG. 1;

[Explanation of symbols]

1. Soundproof case 2. Engine body 3. Cooling fan
4 ... case front wall, 5 ... air intake, 12 ... case (upper) wall,
13: exhaust outlet, 15: exhaust space, 23: cylinder head, 29: exhaust muffler, 37: exhaust fan, 38: exhaust inlet, 40: exhaust outlet pipe, 42: exhaust discharge pipe, 43 ...
Venturi part, 44 ... Terminal opening.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masao Okazaki 64 Ishizukita-machi, Sakai City, Osaka Prefecture Inside Kubota Sakai Works, Ltd. Inventor Sada Tsuji 64 Ishizu-Kitacho, Sakai-shi, Osaka, Japan, inside Kubota Sakai Works, Ltd. (72) JP-A-179821 (JP, A) JP-A-53-21339 (JP, A) JP-A-61-162546 (JP, U) JP-A-4-59332 (JP, U) JP-A-51-4802 (JP, U) (58) Fields surveyed (Int.Cl. ⁶ , DB name) F01P 5/06

Claims (3)

(57) [Claims] 1. A vertical engine body in a soundproof case (1).
(2) is accommodated, and a cooling fan is provided in front of the engine body (2).
Attach the exhaust muffler on the side of the engine body (2).
In the soundproof type engine in which (29) is arranged, a ventilation opening (5) is opened in the case front wall (4) of the soundproof case (1) at a position facing the cooling fan (3), and a predetermined soundproof case (1) is provided. Open the exhaust port (13) on the case wall (12) of the engine body.
In the exhaust muffler (29) side or the exhaust muffler (29) side of the left and right lateral sides of (2), the exhaust muffler (29)
The rear side of, the exhaust outlet exhaust inlet into (13) (38) is provided, exhauster extending up from the exhaust inlet (38) to the air discharge port (13)
A soundproof engine characterized in that an exhaust fan (37) is provided in the space (15) . 2. The soundproof type engine according to claim 1, wherein an exhaust muffler 29 is provided at a position lower than the cylinder head 23, and an exhaust outlet pipe (40) led backward from the exhaust muffler (29) is a soundproof case. (1) Case upper wall (12)
A soundproof engine that has been launched for 3. The soundproof type engine according to claim 2, wherein an exhaust discharge pipe is provided on a case upper wall (12) of the soundproof case (1).
(42), and a venturi section is provided in this exhaust discharge pipe (42).
(43) is provided therein, and the end opening (44) of the exhaust outlet pipe (42) faces the venturi section (43).